Improvement in tuyeres for cupola-furnaces



F. LAWRENCE. Improvement in Tuyeres for Cupola-Furnaces.

Patented April 25,1871.

WITNESSESE Z Z dinitdi $3125 FRANKLIN LAWRENCE, OF PHILADELPHIA,PENNSYLVANIA.

Letters Patent No.114,158, dated April 25, 1811.

IMPROVEMENT IN TUVERES FOR CUPOLA-FURNACES.

The Schedule referred to in these Letters Patent and making part of thelame.

I, FRANKLIN L'AwnnNon, of Philadelphia, county of Philadelphia, State ofPennsylvania, have invented an Improved 'luyere for Gupola-Furnaees, ofwhich the following is a specification.

Nature and Object of the Invention.

My invention consists of a ,castiron tuyere made in the peculiar mannertoo fully explained hereafter to need preliminary description, for thepurpose of introducing into the furnace blasts of a more efiicientcharacter than are forced into ordinary furnaces of this class, and forthe purpose of afibrdin g facilities for build ng the said tuyeres intothe wall of the furnace.

Description of the Accompanying Drawing.

Figure 1 is a vertical section of part of a cupolafurnace illustratingmy improved tuyeres Figure 2, a sectional plan on the line- 1 2, fig. 1;and

Figure 3, a perspective view of one of the tuyeres.

General Description.

A is the base plate of the cnpola, supported by brackets on columns B inthe usual manner, and

Dis the brick lining of the furnace, inolosed by a casing, E, whichextends to the base plate A, the in terior of the furnace beingcontracted at the lower end as usual, and an annular blast-chamber, F,being formed around this contracted portion of the furnace.

My improved tuyeres will be best understood by rel'erring to theperspective view, fig. 3, each tuyere being made of cast-iron and of thepeculiar shape there shown-that is, with a large square base, a, unitedto and forming a part of the contracted upper portion 11 of the samelength as the base, in which is the large iuyercdiole d, the contractedportion having atuyereliolevvhich deci easesiwwidth firom the bottomupward,

and which may be subdivided into any desired number of separate holes bywebs or partitions e e, the sole object of 'which, however, is tostrengthen the casting.

These tuyeres are built in the'lining of the contracted portion of thefurnace, as shown infigs. 1 and 2, their holes forming the solecommunication between the blast-chamber F and the interior of thefurnace.

I have found by repeated and long-continued experiments that by soarranging. the tuyeres of cupolafurnaces that the volume of compressedair forced into the furnace is greater below than above, the effect asregards the reduction of the metal is much more rapid than when theblast is admitted in the usual manner through round holes; and incarrying out this principle I have found that cast-iron tnyeres of theform shown in fig. 3 are both efficient and economical, for while theholes are so arranged that the blast through them decreases in volumefrom the base upward, the exterior of the tuyeres is of such shape as toadmit of their being easily built in and form a part of the lining.

It should be understood that the tuyeres do not extend quite to theinner surface of the lining, but that they are there protected by alayer of clay.

Claim.

witnesses.

V FRANK. LAWRENCE. Witnesses: l

WM. A. STEEL,

HARRY SMITH.

